Malicious PDF — malware analysis report

Static analysis result for SHA-256 91977e6ab370ae97…

MALICIOUS

PDF

34.8 KB Created: 2020-08-31 05:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4427eee089883d906de0bd03d4bd9fa2 SHA-1: 3de3cd290a55e40c9597b6e4b76862367993a34d SHA-256: 91977e6ab370ae97e7e924604c84984d346fa58d53be3fa48c6ae24674a4a2a8
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wix?keyword=chapter+11+geometry+test', is likely intended to lead the user to a malicious site. The document also contains a large number of embedded links, many pointing to 'static.usrfiles.com', suggesting a link farm or SEO poisoning tactic to mask the malicious redirector.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=chapter+11+geometry+test
    • https://static.usrfiles.com/ugd/b8c837_a780ce450f614092ad228dac8e8e6997.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a71ef40ea9d49809e09974973cf19bb.pdf
    • https://static.usrfiles.com/ugd/4479ed_4967c087a8d54f3ab690670d83c14c3d.pdf
    • https://static.usrfiles.com/ugd/ba3095_c12866f9f7224be3ae80b3e66176e41c.pdf
    • https://static.usrfiles.com/ugd/b8c837_685805a2e6f94bc3a55f425cf588e642.pdf
    • https://cdn.shopify.com/s/files/1/0433/3702/3641/files/damaging_property_sentencing_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0446/9984/4762/files/69051563014.pdf
    • https://cdn.shopify.com/s/files/1/0428/5674/3079/files/rasakexodojisetutadokukek.pdf
    • https://cdn.shopify.com/s/files/1/0440/8950/7990/files/short_form_partnership_agreement.pdf
    • https://static.usrfiles.com/ugd/756799_5ee17c81ccce4f0a95cf3ebaabb5faf6.pdf
    • https://static.usrfiles.com/ugd/0d089b_b78ff02607354154a2bb6362c1eda81b.pdf
    • https://static.usrfiles.com/ugd/52b593_2d3bdd1e7f1b4c1f8cafbb08273cec45.pdf
    • https://static.usrfiles.com/ugd/73c254_669e8aa820274cb0847ae8c0dce05101.pdf
    • https://static.usrfiles.com/ugd/0d9a50_c4d6995e441f4b5082bcf857a98f0199.pdf
    • https://static.usrfiles.com/ugd/2e16aa_b02f540db8994227a8bc7e8a4236af8d.pdf
    • https://static.usrfiles.com/ugd/77d535_b52cf734ff0b462d859d1aba4ae0bc22.pdf
    • https://static.usrfiles.com/ugd/e4bc37_df4b1045ae9b4bf9a5517b2a511fc9f8.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049dc.bin
d3e588555f677c0eb9b72b7175be9756377636bd29c753172bf55e7033b87e26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49DC 5260 bytes
font_01_sfnt_off00005bb2.bin
48487da3f60e0546d0570815eb58361786bfef20c0c079438be4d91df0ae85ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB2 10192 bytes

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